Optical signatures of Dirac nodal lines in NbAs 2

Shao, Yinming; Sun, Zhiyuan; Wang, Ying; Xu, Chenchao; Sankar, Raman; Breindel, Alexander J.; Cao, Chao; Fogler, Michael M.; Millis, Andrew J.; Chou, Fangcheng; Li, Zhiqiang; Timusk, Thomas; Maple, M. Brian; Basov, D. N.

doi:10.1073/pnas.1809631115

Title: Optical signatures of Dirac nodal lines in NbAs ₂

Journal Article · Mon Dec 17 00:00:00 EST 2018 · Proceedings of the National Academy of Sciences of the United States of America

DOI:https://doi.org/10.1073/pnas.1809631115· OSTI ID:1487292

;

; Wang, Ying; Xu, Chenchao; Sankar, Raman; Breindel, Alexander J.; Cao, Chao;

; Millis, Andrew J.; Chou, Fangcheng; Li, Zhiqiang; Timusk, Thomas; Maple, M. Brian; Basov, D. N.

Using polarized optical and magneto-optical spectroscopy, we have demonstrated universal aspects of electrodynamics associated with Dirac nodal lines that are found in several classes of unconventional intermetallic compounds. We investigated anisotropic electrodynamics of ${N b A s}_{2}$ where the spin-orbit coupling (SOC) triggers energy gaps along the nodal lines. These gaps manifest as sharp steps in the optical conductivity spectra $σ_{1} (ω)$ . This behavior is followed by the linear power-law scaling of $σ_{1} (ω)$ at higher frequencies, consistent with our theoretical analysis for dispersive Dirac nodal lines. Magneto-optics data affirm the dominant role of nodal lines in the electrodynamics of ${N b A s}_{2}$ .

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Research Organization:: Univ. of California, San Diego, CA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; US Army Research Office (ARO); Moore Foundation; Ministry of Science and Technology in Taiwan; National Science Foundation (NSF)

Grant/Contract Number:: FG02-04-ER46105; FG02-04ER46105; W911NF17-1-0543; GBMF4533; 106-2119-M-002-035-MY3; DMR-1157490

OSTI ID:: 1487292

Alternate ID(s):: OSTI ID: 1609539

Journal Information:: Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Vol. 116 Journal Issue: 4; ISSN 0027-8424

Publisher:: National Academy of SciencesCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 52 works

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nodal-line semimetal
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Title: Optical signatures of Dirac nodal lines in NbAs 2

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Title: Optical signatures of Dirac nodal lines in NbAs ₂